Why not just try it yourself? Save. Stuff [censored] in containers. Wait. Wait. Wait. Wait some more. Then check the containers. If anything disappears, reload your old save. Probably faster than waiting for confirmation here.
edit When I say 'wait' I mean for 24 hours. 3 or 4 days, basically. I think it's 3 days for this sort of thing? Dunno because I only ever use the storage at my motel room.
Or you don't have to save it if you just put a couple of junk, worthless items in there to test it. No need to reset if it doesn't save right? Just toss a couple coffee mugs or even a mutilated leg you got from the REPCONN Test Site (2 pounds, 0 Value. Why even pick it up?) and wait a few days.
It would be much quicker to just test this yourself. Do this with any container you want to test.